/* NeiroGen Online Learning System - Design System Styles */
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: #d7ecf8b3; border-radius: 999px; }
*::-webkit-scrollbar-thumb { background: #237b91aa; border: 2px solid transparent; background-clip: padding-box; border-radius: 999px; }
*::-webkit-scrollbar-thumb:hover { background-color: #237b91; }
*::-webkit-scrollbar-thumb:active { background-color: #175a6c; }
*::-webkit-scrollbar-corner { background: transparent; }
@supports not selector(::-webkit-scrollbar) {
  * { scrollbar-width: thin; scrollbar-color: #237b91 #d7ecf8; }
}

@font-face {
  font-family: Manrope;
  src: url('/assets/fonts/manrope-variable.ttf') format('truetype');
  font-weight: 200 800;
  font-display: swap;
}

:root {
  --ink: #102f3a;
  --accent: #237b91;
  --accent-hover: #1c6b80;
  --accent-active: #175a6c;
  --surface: #d7ecf8ed;
  --surface-solid: #e8f4fb;
  --surface-card: #f2f9ffa6;
  --surface-input: #ffffffd9;
  --surface-bubble: #e7f0efe8;
  --border-glass: #ffffffb3;
  --border-subtle: #ffffff85;
  --shadow-panel: 0 16px 40px #102f3a14;
  --shadow-button: 0 8px 26px #185e7433;
  --radius-panel: 20px;
  --radius-card: 18px;
  --radius-pill: 24px;
  --transition-smooth: 420ms cubic-bezier(0.22, 1, 0.36, 1);
  --font-main: Manrope, 'Segoe UI', system-ui, sans-serif;
  --site-edge: clamp(24px, 4vw, 72px);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font-main);
  font-synthesis: none;
  color: var(--ink);
  background: #9ac3dc;
  overflow-x: hidden;
  color-scheme: light;
  -webkit-font-smoothing: antialiased;
}

[hidden] {
  display: none !important;
}

/* Background canvas/video layer */
.learn-bg video { opacity: 0; transition: opacity 300ms ease; }
.learn-bg video.is-playing { opacity: 1; }
guest-portal, admin-portal { display: block; }
guest-portal.is-ready, admin-portal.is-ready { animation: learn-content-in 220ms ease-out both; }
.portal-loading { width: fit-content; margin: 48px auto; color: var(--ink); animation: learn-content-in 180ms 500ms ease-out both; }
@keyframes learn-content-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: learn-page-out 160ms ease both; }
::view-transition-new(root) { animation: learn-page-in 200ms ease both; }
@keyframes learn-page-out { to { opacity: 0; } }
@keyframes learn-page-in { from { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
}
.learn-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: #9ac3dc;
  pointer-events: none;
}

.learn-bg video, .learn-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.learn-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: #d8ecf512;
}

/* Container */
.learn-container {
  position: relative;
  z-index: 1;
  width: 100%;
  margin: 0 auto;
  padding: 124px var(--site-edge) 60px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Header */
.learn-header {
  height: 72px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-panel);
  background: var(--surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-panel);
  margin-bottom: 28px;
  flex-shrink: 0;
}

.learn-brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.learn-wordmark {
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.06em;
  font-weight: 750;
}

.learn-wordmark span {
  font-weight: 450;
}

.learn-badge {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  background: #ffffff90;
  padding: 3px 8px;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
}

.learn-header-nav {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-status {
  font-size: 14px;
  font-weight: 600;
  color: #365762;
  white-space: nowrap;
}

/* Buttons */
button, a.btn {
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  border: none;
  border-radius: var(--radius-pill);
  padding: 10px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-smooth);
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible, a.btn:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid #ffffff70;
  box-shadow: var(--shadow-button);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  background: var(--accent-active);
  transform: translateY(0);
}

.btn-secondary {
  background: #ffffffcc;
  color: var(--ink);
  border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
  background: #ffffff;
  color: var(--accent);
  transform: translateY(-1px);
}

.btn-danger {
  background: #f8e1e1d0;
  color: #a82525;
  border: 1px solid #ffffffb3;
}

.btn-danger:hover {
  background: #f5cfcf;
}

.btn-ghost {
  background: transparent;
  color: #365762;
  padding: 8px 14px;
}

.btn-ghost:hover {
  color: var(--accent);
  background: #ffffff50;
}

.btn-sm {
  font-size: 13px;
  padding: 6px 14px;
}

/* Frosted glass panels */
.learn-panel {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-panel);
  background: var(--surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-panel);
  padding: clamp(24px, 3.5vw, 40px);
}

/* Typography */
h1.learn-title, h2.learn-title {
  font-size: clamp(28px, 3.2vw, 42px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 8px;
}

p.learn-subtitle {
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.5;
  color: #365762;
  margin-bottom: 24px;
}

/* Form inputs */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

label.form-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  font-family: inherit;
  font-size: 16px;
  color: var(--ink);
  padding: 12px 16px;
  background: var(--surface-input);
  border: 1px solid var(--border-glass);
  border-radius: 14px;
  outline: none;
  transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px #237b9122;
}

.form-textarea {
  min-height: 110px;
  resize: vertical;
  line-height: 1.5;
}

/* Auth Cards */
.auth-box {
  margin: 0 auto;
  width: 100%;
}

@media (min-width: 1024px) { .auth-box { width: 50%; } }
.auth-heading { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.auth-heading .learn-title { margin-bottom: 0; min-width: 0; }
.auth-dev-icon { display: grid; place-items: center; flex: 0 0 36px; width: 36px; height: 36px; padding: 0; border: 1px solid var(--border-subtle); border-radius: 50%; background: transparent; color: var(--accent); cursor: pointer; }
.auth-dev-icon:hover { background: var(--surface-input); }
.auth-dev-icon:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

guest-portal, admin-portal { display: block; min-width: 0; }
.learn-account-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.learn-account-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.learn-account-bar .user-status { white-space: normal; overflow-wrap: anywhere; }
.auth-box form { margin-top: 24px; }
.auth-box #owner-form { display: grid; gap: 12px; }
.auth-box #owner-form > .btn { justify-self: start; }

.user-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: #ffffff80;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
}

.user-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid #ffffff;
}

/* Social & Fast Auth */
.social-auth-section {
  margin-bottom: 24px;
}

.social-auth-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: #436570;
  text-align: center;
  margin-bottom: 12px;
}

.social-auth-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 10px;
  border-radius: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  background: #ffffffcf;
  border: 1px solid var(--border-subtle);
  box-shadow: inset 0 1px 0 #ffffff;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-smooth);
}

.social-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  background: #ffffff;
  box-shadow: 0 4px 14px #102f3a12;
}

.social-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.social-btn .social-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.social-telegram {
  color: #1783b9;
}
.social-telegram:hover:not(:disabled) {
  border-color: #24a1de88;
  background: #f0f9ff;
}

.social-google {
  color: #3c4043;
}
.social-google:hover:not(:disabled) {
  border-color: #4285f488;
  background: #f8fbff;
}

.social-yandex {
  color: #c92f15;
}
.social-yandex:hover:not(:disabled) {
  border-color: #fc3f1d88;
  background: #fff8f6;
}

.auth-divider {
  position: relative;
  text-align: center;
  margin: 22px 0 14px;
}

.auth-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border-subtle);
  z-index: 1;
}

.auth-divider span {
  position: relative;
  z-index: 2;
  background: #ebf6fa;
  padding: 0 12px;
  font-size: 12px;
  font-weight: 600;
  color: #557884;
}


.auth-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  background: #ffffff50;
  padding: 4px;
  border-radius: 16px;
  border: 1px solid var(--border-subtle);
}

.auth-tab {
  flex: 1;
  padding: 8px 12px;
  text-align: center;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  color: #365762;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-smooth);
}

.auth-tab.active {
  background: #ffffff;
  color: var(--accent);
  box-shadow: 0 2px 8px #102f3a10;
}

/* Guest Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 16px;
}

.card-material {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-panel);
  background: var(--surface-card);
  box-shadow: inset 0 1px 0 #ffffff80, inset 0 -1px 0 #ffffff30, 0 8px 24px #102f3a0a;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
  cursor: pointer;
}

.card-material:hover {
  transform: translateY(-4px);
  box-shadow: inset 0 1px 0 #ffffff80, inset 0 -1px 0 #ffffff30, 0 16px 36px #102f3a14;
}

.card-preview {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #c5dfef;
  overflow: hidden;
}

.card-type-badge { position: absolute; top: 12px; right: 12px; z-index: 1; padding: 6px 12px; border: 1px solid #ffffffb3; border-radius: 999px; background: #e8f4fbeb; color: var(--ink); font-size: 12px; font-weight: 700; line-height: 1.3; backdrop-filter: blur(12px); pointer-events: none; }
.card-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card-preview-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #cde3f3, #b6d7ea);
  color: var(--accent);
  font-size: 32px;
}

.card-type-pill {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  color: var(--ink);
  font-size: 12px;
  font-weight: 750;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid #ffffffa0;
  display: flex;
  align-items: center;
  gap: 5px;
}

.card-duration-pill {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(16, 47, 58, 0.75);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 8px;
}

.card-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.3;
  margin-bottom: 8px;
  color: var(--ink);
}

.card-desc {
  font-size: 14px;
  line-height: 1.5;
  color: #365762;
  margin-bottom: 16px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-action {
  margin-top: auto;
  align-self: flex-start;
  font-size: 14px;
  color: var(--accent);
  font-weight: 750;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: #365762;
}

.empty-state h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

/* Modal Viewer */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(16, 47, 58, 0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 250ms ease-out;
}

.modal-dialog {
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  background: var(--surface-solid);
  border: 1px solid var(--border-glass);
  border-radius: 24px;
  box-shadow: 0 24px 60px #102f3a28;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: scaleIn 300ms cubic-bezier(0.22, 1, 0.36, 1);
}

.modal-header {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #ffffffa0;
  background: var(--surface);
  flex-shrink: 0;
}

.modal-header h3 {
  font-size: 19px;
  font-weight: 750;
  letter-spacing: -0.02em;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 24px;
  line-height: 1;
  color: #365762;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
}

.modal-close:hover {
  background: #ffffff70;
  color: var(--ink);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.modal-media-wrap {
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  background: #000;
  box-shadow: 0 8px 24px #102f3a14;
}

.modal-media-wrap video {
  width: 100%;
  max-height: 520px;
  display: block;
}

.modal-audio-wrap {
  background: var(--surface);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.modal-audio-wrap audio {
  width: 100%;
  min-width: 0;
  display: block;
  color-scheme: light;
  accent-color: var(--accent);
}
.modal-audio-wrap audio::-webkit-media-controls-panel { background: var(--surface-solid); }
.modal-audio-wrap.has-custom-audio { padding: 16px; }
.has-custom-audio > audio { display: none; }
.audio-controls { width: 100%; min-width: 0; }
.audio-control-bar { display: flex; align-items: center; gap: 8px; }
.audio-control-bar > button { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; width: 36px; height: 40px; padding: 0; font-size: 12px; }
.audio-control-bar > .audio-play { width: 40px; border-radius: 50%; }
.audio-time { flex: 1; min-width: 0; font-size: 12px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.audio-seek { display: block; width: 100%; height: 32px; margin: 8px 0 0; padding: 0; appearance: none; background: transparent; cursor: pointer; accent-color: var(--accent); }
.audio-seek::-webkit-slider-runnable-track { height: 6px; border-radius: 999px; background: linear-gradient(to right, var(--accent) var(--audio-progress, 0%), #a9ccd5 var(--audio-progress, 0%)); }
.audio-seek::-webkit-slider-thumb { appearance: none; width: 20px; height: 20px; margin-top: -7px; border: 3px solid white; border-radius: 50%; background: var(--accent); box-shadow: 0 1px 5px #102f3a33; }
.audio-seek::-moz-range-track { height: 6px; border-radius: 999px; background: #a9ccd5; }
.audio-seek::-moz-range-progress { height: 6px; border-radius: 999px; background: var(--accent); }
.audio-seek::-moz-range-thumb { width: 14px; height: 14px; border: 3px solid white; border-radius: 50%; background: var(--accent); box-shadow: 0 1px 5px #102f3a33; }
.audio-seek:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 8px; }
.audio-seek:disabled { opacity: .5; cursor: default; }
.audio-control-status { display: block; font-size: 12px; color: #8f2323; }
.audio-control-status:empty { display: none; }

.modal-text-content {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  white-space: pre-wrap;
  word-break: break-word;
  background: #ffffffa0;
  padding: 24px;
  border-radius: 16px;
  border: 1px solid var(--border-subtle);
}

.modal-desc {
  font-size: 15px;
  line-height: 1.6;
  color: #365762;
}

.modal-footer {
  padding: 16px 24px;
  background: var(--surface);
  border-top: 1px solid #ffffffa0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-shrink: 0;
}

/* Upload dropzone and compression progress */
.upload-dropzone {
  border: 2px dashed #237b9160;
  border-radius: 16px;
  padding: 32px 20px;
  text-align: center;
  background: #ffffff60;
  cursor: pointer;
  transition: all var(--transition-smooth);
}

.upload-dropzone:hover, .upload-dropzone.dragover {
  border-color: var(--accent);
  background: #ffffffa0;
}

.progress-container {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background: #00000010;
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 200ms ease;
}

.progress-status-text {
  font-size: 13px;
  font-weight: 600;
  color: #365762;
}

/* Admin Material Table / List */
.admin-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.admin-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  background: #ffffffa0;
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  transition: all var(--transition-smooth);
}

.admin-item:hover {
  background: #ffffff;
  box-shadow: 0 4px 16px #102f3a0a;
}

.admin-item-info {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.admin-item-thumb {
  width: 64px;
  height: 48px;
  border-radius: 8px;
  background: #c5dfef;
  object-fit: cover;
  flex-shrink: 0;
}

.admin-item-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.admin-item-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.admin-item-sub {
  font-size: 13px;
  color: #365762;
}

.admin-item-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

/* Responsive tweaks */
@media (max-width: 767px) {
  :root { --site-edge: 16px; }
  html, body, .learn-container { min-height: 100svh; }
  /* Browser toolbars change the visible height during scroll. Keep the cover
     crop tied to the large viewport instead of resizing it with the toolbars. */
  .learn-bg {
    bottom: auto;
    height: 100vh;
    height: 100lvh;
    transform: translateZ(0);
    backface-visibility: hidden;
  }
  .learn-container {
    padding: 88px var(--site-edge) 40px;
  }
  .learn-bg video, .learn-bg img { filter: blur(1.2px); transform: scale(1.018); }
  .learn-header {
    height: 64px;
    padding: 0 16px;
  }
  .learn-wordmark {
    font-size: 22px;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .admin-item {
    flex-direction: column;
    align-items: flex-start;
  }
  .admin-item-actions {
    width: 100%;
    justify-content: flex-end;
  }
  .modal-dialog {
    max-height: 95vh;
  }
}

/* Reliable learning flows */
.learn-notice { margin: 16px 0; padding: 12px 16px; border: 1px solid var(--border-glass); border-radius: 12px; background: var(--accent); color: #fff; text-align: center; overflow-wrap: anywhere; }
.learn-notice.is-error { color: #8f2323; background: #fff3f0; border-color: #b85545; }
admin-portal .learn-notice { width: fit-content; max-width: 100%; box-sizing: border-box; margin: 16px auto; animation: admin-notice-in 300ms ease-out; transition: opacity 300ms ease, transform 300ms ease; }
admin-portal .learn-notice.is-dismissing { opacity: 0; transform: translateY(-6px); }
@keyframes admin-notice-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.learn-hint { color: #365762; font-size: 13px; line-height: 1.6; margin: 8px 0 16px; }
.learn-editor { max-width: 860px; width: 100%; margin-inline: auto; }
fieldset { border: 0; min-width: 0; padding: 0; }
button:disabled, fieldset:disabled { opacity: .65; cursor: wait; }
.editor-actions, .auth-links { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin: 16px 0; }
.admin-material-row { display: flex; justify-content: space-between; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--border-subtle); }
.admin-material-row h2 { font-size: 18px; overflow-wrap: anywhere; }
.admin-material-row p { margin-top: 8px; font-size: 13px; }
.upload-status { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 20px 0; }
.upload-status progress { width: 100%; accent-color: var(--accent); }
.article-editor { min-height: 280px; }
.learn-dialog { position: fixed; inset: 0; margin: auto; padding: 0; width: min(900px, calc(100vw - 32px)); max-height: calc(100dvh - 32px); color: var(--ink); }
.learn-dialog:not([open]) { display: none; }
.viewer-loading-status { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); z-index: 10; max-width: calc(100vw - 32px); padding: 12px 20px; border: 1px solid var(--border-glass); border-radius: var(--radius-pill); background: var(--accent); color: white; box-shadow: var(--shadow-button); text-align: center; pointer-events: none; }
.learn-dialog::backdrop { background: #102f3a99; backdrop-filter: blur(8px); }
.learn-dialog .modal-header h2 { font-size: 20px; overflow-wrap: anywhere; }
.lesson-player { width: 100%; display: block; }
.modal-body > * { flex-shrink: 0; }
.lesson-player:is(video) { max-height: min(55dvh, 520px); object-fit: contain; }
.modal-content-column, .modal-details { min-width: 0; display: flex; flex-direction: column; gap: 20px; }
.modal-details { flex-grow: 1; }
.modal-details:empty, .player-status:empty { display: none; }
.modal-body { overscroll-behavior: contain; }
.modal-details > .question-panel { margin-top: auto; }
.modal-desc { overflow-wrap: anywhere; }
.learn-dialog.video-viewer { width: min(900px, calc(100vw - 32px), calc(65dvh * var(--video-ratio, 1.777778) + 48px)); }
.video-viewer .modal-media-wrap { width: 100%; aspect-ratio: var(--video-ratio, 1.777778); }
.video-viewer .lesson-player { width: 100%; height: auto; max-height: none; aspect-ratio: var(--video-ratio, 1.777778); }
@media (min-width: 768px) {
  .learn-dialog.video-viewer.is-portrait { width: min(1000px, calc(100vw - 32px), calc(65dvh * var(--video-ratio) + 492px)); }
  .video-viewer.is-portrait .modal-body { display: grid; grid-template-columns: minmax(0, calc(65dvh * var(--video-ratio))) minmax(0, 1fr); align-items: start; gap: 24px; }
  .video-viewer.is-portrait .modal-details { align-self: stretch; }
}
@media (max-width: 767px) {
  .learn-dialog.video-viewer { width: calc(100vw - 16px); }
  .video-viewer .modal-content-column { width: min(100%, calc(65dvh * var(--video-ratio, 1.777778))); align-self: center; }
}
.question-panel { border-top: 1px solid var(--border-glass); padding-top: 20px; }
.question-panel h3 { margin-bottom: 16px; }
.question-thread { padding: 16px; border-radius: 12px; background: var(--surface-input); margin-bottom: 12px; white-space: pre-wrap; overflow-wrap: anywhere; }
.question-answer { margin-top: 12px; padding: 12px; border-left: 3px solid var(--accent); }
.question-label { color: #365762; font-size: 12px; margin-bottom: 8px; }
.question-form .form-label { margin-top: 12px; }
.question-form-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 16px; }
.question-form-actions > .learn-hint { flex: 1; min-width: 0; margin: 0; }
.question-form-actions > button { flex-shrink: 0; margin: 0; }
.cards-grid { grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr)); }
.auth-tabs { flex-wrap: wrap; }
.auth-tabs .auth-tab { flex: 1 1 88px; }
button.card-material { padding: 0; text-align: left; color: var(--ink); font-weight: 400; font-size: 15px; line-height: 1.5; width: 100%; align-items: stretch; gap: 0; }
.card-content, .card-title, .card-desc, .card-action { display: block; }
.form-input:focus-visible, .form-textarea:focus-visible, .card-material:focus-visible, select:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
@media (max-width: 600px) { .learn-header { height: auto; min-height: 72px; padding: 16px; flex-wrap: wrap; } .learn-header-nav { width: 100%; flex-wrap: wrap; } .user-status { white-space: normal; overflow-wrap: anywhere; } .admin-material-row { flex-direction: column; } .modal-body { padding: 16px; } .learn-dialog { width: calc(100vw - 16px); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }

/* Authentication section adapted from RegistrationDialogCis. */
.auth-reference-card.auth-box { position: relative; width: 100%; margin: 0; padding: 28px; border-color: var(--border-glass); background: var(--surface); box-shadow: inset 0 1px 0 #ffffffb3; }
@media (min-width: 768px) { .auth-reference-card.auth-box { width: 50%; margin-inline: auto; } }
.auth-reference-card .auth-heading { justify-content: center; gap: 8px; padding-inline: 24px; margin: 0 0 12px; }
.auth-reference-card h1.learn-title { font-size: 23px; font-weight: 600; line-height: 1.25; letter-spacing: -.6px; text-align: center; }
.auth-reference-card .auth-dev-icon { width: 28px; height: 28px; flex-basis: 28px; border: 0; }
.auth-reference-card button:focus-visible, .auth-reference-card a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.auth-description { margin: 0 0 20px; color: #557884; font-size: 13px; line-height: 1.65; text-align: center; overflow-wrap: anywhere; }
.auth-provider-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-bottom: 18px; }
.auth-provider { position: relative; display: flex; align-items: center; justify-content: center; gap: 8px; min-width: 0; min-height: 52px; padding: 10px 12px; border: 1px solid #a9ccd5; border-radius: 8px; background: var(--surface-input); font: inherit; font-size: 14px; font-weight: 600; color: var(--accent); text-decoration: none; cursor: pointer; transition: background-color .2s, border-color .2s; }
.auth-provider:hover { background: white; border-color: var(--accent); }
.auth-provider[aria-disabled="true"] { pointer-events: none; opacity: .65; }
.auth-provider-badge { display: grid; place-items: center; flex: 0 0 20px; width: 20px; height: 20px; font-size: 20px; font-weight: 750; }
.auth-provider-badge svg { display: block; width: 20px; height: 20px; }
.auth-provider-yandex .auth-provider-badge { color: #cf363d; }
.auth-provider-telegram .auth-provider-badge { color: #1689bb; }
.auth-provider:disabled { cursor: default; }
.auth-reference-divider { display: flex; align-items: center; gap: 12px; margin: 16px 0; color: #557884; font-size: 10px; line-height: 1.5; text-align: center; }
.auth-reference-divider::before, .auth-reference-divider::after { content: ''; height: 1px; flex: 1; background: #a9ccd5; }
.auth-mode-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 3px; margin-bottom: 18px; padding: 3px; border: 1px solid #a9ccd5; border-radius: 9px; background: #c4e0ec; }
.auth-mode-tabs button { padding: 8px; border: 0; border-radius: 6px; color: #557884; background: transparent; font: inherit; font-size: 12px; cursor: pointer; }
.auth-mode-tabs button[aria-pressed="true"] { background: var(--surface-input); color: var(--ink); box-shadow: 0 1px 4px #102f3a14; }
.auth-mode-tabs button:disabled, .auth-text-button:disabled { cursor: default; }
.auth-reference-card form { margin-top: 0; }
.auth-reference-card .form-group { gap: 6px; margin-bottom: 12px; }
.auth-reference-card .form-label { color: #365762; font-size: 12px; font-weight: 500; }
.auth-reference-card .form-input { min-height: 42px; padding: 10px 12px; border: 1px solid #a9ccd5; border-radius: 8px; color: var(--ink); font-size: 14px; }
.auth-reference-card .form-input::placeholder { color: #6f929e; font-size: 12px; }
.auth-reference-card .form-input:focus { border-color: var(--accent); }
.auth-forgot-row { display: flex; justify-content: flex-end; margin-top: -2px; }
.auth-text-button, .auth-back-button { padding: 0; border: 0; color: var(--accent); background: transparent; font: inherit; font-size: 12px; line-height: 1.5; cursor: pointer; }
.auth-text-button:hover:not(:disabled), .auth-back-button:hover { text-decoration: underline; }
.auth-back-button { display: flex; align-items: center; justify-content: center; gap: 6px; margin: 18px auto 0; }
.auth-inline-hint { margin-bottom: 12px; color: #557884; font-size: 12px; line-height: 1.6; }
.auth-success-box { padding: 16px; border: 1px solid #8bbac8; border-radius: 8px; background: #c6e7e7; color: var(--ink); font-size: 13px; line-height: 1.65; overflow-wrap: anywhere; }
.auth-reference-card .auth-submit { width: 100%; min-height: 54px; margin-top: 22px; padding: 12px; border: 1px solid #8bbac8; border-radius: 8px; background: #b7dce8; color: #175a6c; box-shadow: 0 4px 12px #185e7414; font-size: 15px; font-weight: 600; line-height: 1.4; white-space: normal; }
.auth-reference-card .auth-submit:hover:not(:disabled) { background: #a3d2e1; color: var(--ink); transform: none; }
.auth-reference-card #owner-form { gap: 6px; }
.auth-reference-card #owner-form > .auth-submit { justify-self: stretch; }
.auth-reference-card .learn-notice { margin: 12px 0 0; padding: 10px 12px; font-size: 12px; line-height: 1.5; }

/* Owner materials and accessible file pickers. */
.file-picker { position: relative; display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 16px; padding: 12px; border: 1px solid var(--border-glass); border-radius: 14px; background: var(--surface-input); cursor: pointer; }
.file-picker-input { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.file-picker-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 20px; border: 1px solid var(--border-glass); border-radius: var(--radius-pill); background: #ffffffcc; color: var(--ink); font-size: 15px; font-weight: 700; line-height: 1.2; }
.file-picker-name { min-width: 0; color: #365762; font-size: 14px; line-height: 1.5; overflow-wrap: anywhere; }
.file-picker:focus-within { outline: 3px solid var(--accent); outline-offset: 3px; }
fieldset:disabled .file-picker { cursor: wait; }
.admin-cards-grid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr)); align-items: stretch; }
.admin-material-card { min-width: 0; cursor: pointer; }
.admin-card-cover { display: block; padding: 0; border: 0; flex-shrink: 0; color: var(--ink); font: inherit; cursor: pointer; }
.admin-card-cover:focus-visible { outline: 3px solid var(--accent); outline-offset: -4px; }
.admin-material-card .card-content { display: flex; flex-direction: column; }
.admin-material-card .card-desc { display: -webkit-box; overflow-wrap: anywhere; }
.admin-material-card .card-title { overflow-wrap: anywhere; }
.admin-card-meta { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: nowrap; margin-top: auto; color: #365762; font-size: 12px; }
.admin-card-status { padding: 4px 8px; border: 1px solid var(--border-glass); border-radius: 8px; background: var(--surface-input); font-weight: 600; }
.admin-card-actions { margin: 0; gap: 6px; flex-wrap: nowrap; justify-content: flex-end; }
.admin-card-actions .admin-card-icon { display: inline-flex; align-items: center; justify-content: center; width: 40px; min-width: 40px; height: 40px; padding: 0; border-radius: 50%; }
.admin-card-icon svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.admin-card-icon:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
@media (max-width: 600px) {
  .admin-card-meta { gap: 6px; }
  .admin-card-actions { gap: 4px; }
  .admin-card-actions .admin-card-icon { width: 32px; min-width: 32px; height: 32px; }
  .admin-card-status { padding: 4px 6px; font-size: 11px; white-space: nowrap; }
}
.admin-library-panel { padding: clamp(20px, 2.5vw, 32px); }
.admin-library-panel > .admin-cards-grid { margin-top: 0; }
.admin-library-toolbar { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; gap: 16px; margin: 0 0 24px; }
.admin-library-toolbar > .learn-title { grid-column: 2; margin: 0; text-align: center; font-size: clamp(28px, 2.6vw, 36px); line-height: 1.2; }
.admin-library-actions { grid-column: 3; display: flex; justify-self: end; align-items: center; gap: 12px; }
.admin-library-actions > .btn { height: 44px; white-space: nowrap; }
.material-editor-actions { display: flex; justify-content: flex-end; align-items: stretch; gap: 12px; margin-top: 24px; }
.material-editor-actions > .btn { min-height: 44px; }
@media (max-width: 767px) {
  .admin-library-actions { justify-self: center; }
  .material-editor-actions { display: grid; grid-template-columns: minmax(0, 1fr) 88px; }
  .material-editor-actions > #publication { grid-column: 1 / -1; }
  .material-editor-actions > .btn { min-width: 0; min-height: 52px; padding: 10px 12px; font-size: 14px; line-height: 1.35; }
}
@media (max-width: 1023px) {
  .admin-library-toolbar { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .admin-library-toolbar > .learn-title { grid-column: 1; }
  .admin-library-actions { grid-column: 1; }
}
@media (max-width: 600px) {
  .file-picker { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .file-picker-button { justify-content: center; }
}
@media (max-width: 1023px) { .auth-provider { flex-direction: column; gap: 6px; min-height: 66px; padding: 8px 4px; font-size: 12px; } }
@media (max-width: 600px) {
  .auth-reference-card.auth-box { padding: 22px 18px 18px; border-radius: 14px; }
  .auth-reference-card h1.learn-title { font-size: 21px; }
  .auth-description { font-size: 12px; line-height: 1.45; margin-bottom: 14px; }
  .auth-provider-grid { margin-bottom: 12px; }
  .auth-provider > span:last-child { white-space: nowrap; }
  .auth-reference-divider { margin: 12px 0; }
  .auth-mode-tabs { margin-bottom: 12px; }
  .auth-reference-card .form-input { font-size: 16px; }
  .auth-reference-card .auth-submit { margin-top: 18px; min-height: 50px; font-size: 14px; }
}